CN217640933U

CN217640933U - PCB plane inductor

Info

Publication number: CN217640933U
Application number: CN202221973938.8U
Authority: CN
Inventors: 苏凉凤
Original assignee: Suzhou Ruiqu Electric Technology Co ltd
Current assignee: Suzhou Ruiqu Electric Technology Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-10-21
Anticipated expiration: 2032-07-28

Abstract

The utility model relates to a PCB plane inductor belongs to the electronic component field, especially relates to a plane inductor. The utility model discloses on directly integrating the PCB board with the inductor, can directly assemble the product of needs on, removed the installation from welding and need special mounting tool. The scheme provides a PCB planar inductor which comprises a transversely arranged PCB, wherein two parallel and bilaterally symmetrical through grooves are vertically arranged on the PCB in a penetrating manner, a spliced magnetic core is fixed on each through groove, the magnetic core is in a shape of a Chinese character kou, and each magnetic core comprises a first magnetic column and a second magnetic column which vertically penetrate through the two through grooves respectively; a first winding surrounding the first magnetic column and a second winding surrounding the second magnetic column and symmetrical to the first winding in structure are printed on the PCB; current is conducted in the first winding and the second winding, the direction of the current in the first winding and the direction of the current in the second winding are the same as the winding direction of the first winding and the winding direction of the second winding respectively, and the direction of the current in each layer of the first winding is the same.

Description

PCB plane inductor

Technical Field

The utility model belongs to the electronic component field especially relates to a PCB planar inductor.

Background

In recent years, high frequency and small size of switching power supplies are important technological trends. With the appearance of the planar inductor, the product size of the high-frequency switching power supply is greatly reduced, and the power density is improved. At present, the inductance value of the planar inductor is generally small, and the size needs to be increased on the structural surface to realize a large inductance value, but the design deviates from the development requirement of miniaturization of the planar inductor, and the requirement of improving the integration level cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is: the inductor in the prior art has the defects of large leakage inductance, large volume, more occupied space and not simple and easy design process, and the inductor in the prior art has the defect of high requirements on the use environment and vibration. The utility model discloses provide a PCB planar inductor is used for solving above-mentioned problem to above problem.

The technical scheme of the utility model is that: a PCB planar inductor comprises a transversely arranged PCB, wherein two parallel and bilaterally symmetrical through grooves are vertically arranged on the PCB in a penetrating manner, a spliced magnetic core is fixed on the through grooves, the magnetic core is in a shape of a Chinese character 'kou', and the magnetic core comprises a first magnetic column and a second magnetic column which respectively vertically penetrate through the two through grooves; a first winding surrounding the first magnetic column and a second winding surrounding the second magnetic column and symmetrical to the first winding in structure are printed on the PCB; the first winding and the second winding are all provided with currents, the directions of the currents in the first winding and the second winding are the same as the winding directions of the first winding and the second winding respectively, and the directions of the currents in the first winding of each layer are the same.

Preferably, the PCB comprises a plurality of parallel board layers, wherein N board layers are inductor layers provided with a first winding and a second winding; different first windings on the inductance layer are electrically connected through via holes on the PCB, and different second windings on the inductance layer are electrically connected through via holes on the PCB.

Preferably, N is an even number; the first windings on each two inductance layers are connected in series end to form a group of series inductors; and N/2 groups of the head ends of the series inductors are connected through via holes on the PCB, and all the tail ends are connected through via holes on the PCB.

Preferably, N is an integer greater than or equal to two; the winding structures of the first windings on each layer of the inductance layer are the same and are all clockwise windings from outside to inside or anticlockwise windings from outside to inside or clockwise windings from inside to outside or anticlockwise windings from inside to outside, all the head ends of the first windings of the N layers of the inductance layer are connected through via holes in the PCB, and all the tail ends of the first windings of the N layers of the inductance layer are connected through via holes in the PCB.

Preferably, the first winding is any one of circular, elliptical and rectangular as a whole.

Preferably, the magnetic core is formed by splicing two sub-magnetic cores with C-shaped sections.

Preferably, the PCB board is an epoxy glass fiber board.

Preferably, the magnetic core is made of MPP.

Compared with the prior art, the utility model has the advantages that:

(1) The utility model discloses on directly integrating the PCB board with the inductor, can directly assemble the product of needs on, removed the installation from welding and need special mounting tool.

(2) The winding of the utility model is arranged on the PCB, so the size and the shape of the required PCB can be designed according to the required inductance, the volume is smaller than that of the traditional vertical or horizontal inductor on the premise of the same inductance, the PCB is not limited to the rectangle, and a special-shaped plate with a special shape can be manufactured according to the requirement, thereby the space is fully utilized, and the volume of the whole set of equipment is reduced; compare in traditional paster inductance, the utility model discloses possess great power under the same volume.

(3) On the basis of withstand voltage PCB board, the utility model discloses need not additionally consider withstand voltage problem, and PCB board accessible large tracts of land exposes the copper and dispels the heat, has improved the working property of product.

(4) The utility model has different performances, for example, the winding turns of the inductor can be increased by series winding, and the inductance of the inductor can be improved; the parallel winding can improve the over-current capability of the line.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a structural diagram of a PCB planar inductor according to the present invention;

fig. 2 is a schematic view of a first embodiment of the present invention;

fig. 3 is a schematic view of a second embodiment of the present invention;

wherein: 1. the PCB comprises a PCB board, 11, a first position, 12, a second position, 13, a third position, 2, a magnetic core, 21, a first magnetic column, 22, a second magnetic column, 31, a first winding, 32, a second winding, 41, a first via hole, 42, a second via hole, 43, a third via hole, 51, a first inductance layer, 52, a second inductance layer, 53, a third inductance layer, 54 and a fourth inductance layer.

Detailed Description

The following detailed description is made in conjunction with specific embodiments of the present invention:

the first embodiment is as follows:

as shown in figures 1-3, the PCB planar inductor comprises a PCB board 1 which is transversely arranged, two parallel through grooves which are bilaterally symmetrical are vertically arranged on the PCB board 1 in a penetrating way, a magnetic core 2 is fixed in each through groove, and the magnetic core 2 consists of two parts and is in a shape of a Chinese character kou. The magnetic core 2 includes two portions that vertically penetrate through the through-groove: a first magnetic post 21 and a second magnetic post 22 (shown in fig. 1). The PCB 1 is printed with windings respectively surrounding the two magnetic columns, and the windings comprise a first winding 31 surrounding the first magnetic column 21 and a second winding 32 surrounding the second magnetic column 22 and having a structure which is bilaterally symmetrical to the first winding 31. The first winding 31 may be any one of circular, elliptical, and rectangular as a whole. The first winding 31 and the second winding 32 are both provided with current, the direction of the current in the first winding 31 and the second winding 32 is the same as the winding direction of the first winding 31 and the second winding 32, and the direction of the current in each layer of the first winding 31 is the same.

In the utility model, the PCB board 1 adopts an epoxy glass fiber board; the magnetic core 2 is made of MPP, and the MPP is selected to be beneficial to reducing loss and improving performance; the magnetic core 2 is formed by splicing two sub-magnetic cores with C-shaped sections. Wherein, it is fixed all through special high temperature resistant glue between logical groove and the magnetic core 2 and between two sub-magnetic cores, and first winding 31 is whole to be the rectangle.

The PCB board 1 is provided with a plurality of layers of board layers arranged in parallel, wherein N layers of board layers are inductance layers provided with a first winding 31 and a second winding 32. A plurality of through holes are formed in the PCB 1, the first windings 31 and the second windings 32 on different inductance layers are electrically connected with other inductance layers through the through holes respectively, and the current directions in the first windings 31 on different inductance layers are the same.

N is an even number, the first windings 31 on each two inductance layers are connected in series end to form a group of series inductors, all the head ends of the N/2 groups of series inductors are connected through via holes on the PCB board 1, and all the tail ends are connected through via holes on the PCB board 1.

Furthermore, in this embodiment, as shown in fig. 2, N is four, the head end of the first winding 31 in the first inductance layer 51 winds around the first magnetic pillar 21 several turns counterclockwise from the outside to the inside to reach the second via hole 42, the tail end of the first winding 31 in the first inductance layer 51 is connected to the head end of the first winding 31 in the second inductance layer 52 through the second via hole 42, and then the head end of the first winding 31 in the second inductance layer 52 continues to wind around the first magnetic pillar 21 several turns counterclockwise and then the tail end is led out from the second location 12. The first winding 31 and the second winding 32 in the third inductance layer 53 and the fourth inductance layer 54 are wound in the same manner as the first winding 31 and the second winding 32 in the first inductance layer 51 and the second inductance layer 52. And the current trend in the first winding 31 in the first inductance layer 51, the second inductance layer 52, the third inductance layer 53 and the fourth inductance layer 54 is the same. The head end of the first winding 31 in the first inductance layer 51 is connected with the head end of the first winding 31 of the third inductance layer 53 through the first via hole 41, and meanwhile, the first via hole 41 on the second inductance layer 52 needs to be out of phase with the first winding 31 on the second inductance layer 52; the tail end of the first winding 31 in the second inductance layer 52 is connected to the tail end of the first winding 31 in the fourth inductance layer 54 through the third via hole 43, and meanwhile, the third via hole 43 on the third inductance layer 53 needs to be away from the first winding 31 on the third inductance layer 53. The winding turns of the inductor can be increased by the design, and the inductance of the inductor is improved.

Example two:

as shown in figures 1-3, the PCB planar inductor comprises a PCB board 1 which is transversely arranged, two parallel through grooves which are bilaterally symmetrical are vertically arranged on the PCB board 1 in a penetrating way, a magnetic core 2 is fixed in each through groove, and the magnetic core 2 consists of two parts and is in a shape of a Chinese character kou. The magnetic core 2 includes two portions that vertically penetrate through the through-groove: a first magnetic cylinder 21 and a second magnetic cylinder 22 (shown in fig. 1). The PCB 1 is printed with windings respectively surrounding the two magnetic columns, and the windings comprise a first winding 31 surrounding the first magnetic column 21 and a second winding 32 surrounding the second magnetic column 22 and having a structure which is bilaterally symmetrical to the first winding 31. The first winding 31 may be formed in any one of a circular shape, an elliptical shape, and a rectangular shape as a whole. The first winding 31 and the second winding 32 are both provided with current, the direction of the current in the first winding 31 and the second winding 32 is the same as the winding direction of the first winding 31 and the second winding 32, and the direction of the current in each layer of the first winding 31 is the same.

The PCB board 1 is provided with a plurality of board layers, wherein N board layers are inductance layers provided with a first winding 31 and a second winding 32. A plurality of through holes are formed in the PCB 1, the first windings 31 and the second windings 32 on different inductance layers respectively penetrate through the through holes and are electrically connected with other inductance layers, and the current directions in the first windings 31 on different inductance layers are the same.

N is an integer greater than or equal to two, the winding structures of the first windings 31 on each layer of inductance layer are the same and are all clockwise windings from outside to inside or anticlockwise windings from outside to inside or clockwise windings from inside to outside or anticlockwise windings from inside to outside, all the head ends of the first windings 31 on the N layers of inductance layers are connected through via holes on the PCB board 1, and all the tail ends of the first windings are connected through via holes on the PCB board 1.

Furthermore, in the present embodiment, as shown in fig. 3, N is four, and the first winding 31 on each inductance layer is wound in the same manner. After the first winding 31 in the first inductance layer 51 winds around the first magnetic pillar 21 from the first position 11 from outside to inside counterclockwise for a plurality of turns, all the head ends of the first winding 31 on the first inductance layer 51, the second inductance layer 52, the third inductance layer 53 and the fourth inductance layer 54 are connected through the first via hole 41 on the PCB board 1; all tail ends of the first windings 31 on the first inductance layer 51, the second inductance layer 52, the third inductance layer 53 and the fourth inductance layer 54 are connected through the second via hole 42 on the PCB board 1; meanwhile, the tail end of the first winding 31 on the first inductance layer 51 crosses the winding in an arch shape from the upper part of the first inductance layer 51 to the third position 13 at the first inductance layer 51 through the second via hole 42 on the first inductance layer 51 by adjusting the copper strip, and the wire is led out; the tail end of the first winding 31 on the fourth inductance layer 54 passes through the second via hole 42 on the fourth inductance layer 54 from below the fourth inductance layer 54 through the adjusting copper strip in an arch shape to cross the winding to the third position 13 at the fourth inductance layer 54 and is led out. By the arrangement, the tail end of the first winding 31 on each layer of the inductance layer can be connected and then electrically connected with an external circuit; the connection mode in the embodiment is beneficial to reducing the influence of parasitic capacitance caused by the layer spacing of the PCB board 1, and the effect of the planar inductor is improved. In this embodiment, when the winding widths of the first winding 31 and the second winding 32 are sufficiently wide, a plurality of vias sequentially penetrating through the first inductance layer 51, the second inductance layer 52, the third inductance layer 53, and the fourth inductance layer 54 may be disposed on the line, so as to improve the over-current capability of the line.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. It is obvious to a person skilled in the art that the invention is not limited to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention, and that the embodiments are therefore to be considered in all respects as exemplary and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A PCB planar inductor, characterized by: the magnetic core is in a square shape, and comprises a first magnetic column and a second magnetic column which vertically penetrate through the two through grooves respectively; a first winding surrounding the first magnetic column and a second winding surrounding the second magnetic column and symmetrical to the first winding in structure are printed on the PCB; the first winding and the second winding are all provided with currents, the directions of the currents in the first winding and the second winding are the same as the winding directions of the first winding and the second winding respectively, and the directions of the currents in the first winding of each layer are the same.

2. A PCB planar inductor according to claim 1, wherein: the PCB comprises a plurality of layers of plate layers which are arranged in parallel, wherein N layers of plate layers are inductance layers provided with a first winding and a second winding; different first windings on the inductance layer are electrically connected through via holes on the PCB, and different second windings on the inductance layer are electrically connected through via holes on the PCB.

3. A PCB planar inductor according to claim 2, wherein: n is an even number; the first windings on each two inductance layers are connected in series end to form a group of series inductors; and N/2 groups of the head ends of the series inductors are connected through via holes on the PCB, and all the tail ends are connected through via holes on the PCB.

4. A PCB planar inductor according to claim 2, wherein: n is an integer greater than or equal to two; the winding structures of the first windings on each layer of the inductance layer are the same and are all clockwise windings from outside to inside or anticlockwise windings from outside to inside or clockwise windings from inside to outside or anticlockwise windings from inside to outside, all the head ends of the first windings of the N layers of the inductance layer are connected through via holes in the PCB, and all the tail ends of the first windings of the N layers of the inductance layer are connected through via holes in the PCB.

5. A PCB planar inductor according to claim 1, wherein: the first winding is wholly in any one of a circle, an ellipse and a rectangle.

6. A PCB planar inductor according to claim 1, wherein: the magnetic core is formed by splicing two sub-magnetic cores with C-shaped sections.

7. A PCB planar inductor according to claim 1, wherein: the PCB board is an epoxy glass fiber board.

8. A PCB planar inductor according to claim 1, wherein: the magnetic core is made of MPP.